package com.leyun68.server.utils;

import org.csource.fastdfs.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;


/**
 * FastDFS 工具类
 */
public class FastDFSUtils {

    private static Logger logger = LoggerFactory.getLogger(FastDFSUtils.class);

    /**
     * 初始化客户端
     * ClientGlobal.init 读取配置文件，并初始化对应属性；
     */
    static {
        try {
//            String FILE_PATH = "D:\\1学习\\1编辑过的程序\\毕业设计-最终版\\leyun_system\\leyun-server\\src\\main\\resources\\fdfs_client.conf";
            String FILE_PATH = "/www/binhaiht.leyun68.com/fdfs_client.conf";

            ClientGlobal.init(FILE_PATH);
        } catch (Exception e) {
            logger.error("初始化 FastDFS 失败", e.getMessage());
        }
    }


    /**
     * 上传文件
     *
     * @param file
     * @return
     */
    public static String[] upload(MultipartFile file) {
        if (null == file) {
            System.out.println("file 空指针！");
        }
        String name = file.getOriginalFilename();
        logger.info("文件名：", name);
        StorageClient storageClient = null;
        String[] uploadResults = null;
        try {
            storageClient = getStorageClient();
            uploadResults = storageClient.upload_file(file.getBytes(), name.substring(name.lastIndexOf(".") + 1), null);

        } catch (Exception e) {
            logger.error("上传文件失败", e.getMessage());
        }
        if (null == uploadResults) {
            logger.error("上传失败", storageClient.getErrorCode());
        }
        return uploadResults;
    }

    /**
     * 获取文件信息
     *
     * @param groupName
     * @param remoteFileName
     * @return
     */
    public static FileInfo getFileInfo(String groupName, String remoteFileName) {
        StorageClient storageClient = null;
        try {
            storageClient = getStorageClient();
            return storageClient.get_file_info(groupName, remoteFileName);
        } catch (Exception e) {
            logger.error("文件信息获取失败", e.getMessage());
        }
        return null;
    }

    /**
     * 下载文件
     *
     * @param groupName
     * @param remoteFileName
     * @return
     */
    public static InputStream downFile(String groupName, String remoteFileName) {
        StorageClient storageClient = null;
        try {
            storageClient = getStorageClient();
            byte[] fileByte = storageClient.download_file(groupName, remoteFileName);
            InputStream inputstream = new ByteArrayInputStream(fileByte);
            return inputstream;
        } catch (Exception e) {
            logger.error("文件下载失败", e.getMessage());
        }
        return null;
    }

    /**
     * 删除文件
     *
     * @param groupName
     * @param remoteFileName
     */
    public static void deleteFile(String groupName, String remoteFileName) {
        StorageClient storageClient = null;
        try {
            storageClient = getStorageClient();
            storageClient.delete_file(groupName, remoteFileName);
        } catch (Exception e) {
            logger.error("文件删除失败", e.getMessage());
        }
    }

    /**
     * 生成 storage 客户端
     *
     * @return
     * @throws IOException
     */
    private static StorageClient getStorageClient() throws IOException {
        TrackerServer trackerServer = getTrackerServer();
        StorageClient storageClient = new StorageClient(trackerServer, null);
        return storageClient;
    }

    /**
     * 生成 tracker 服务器
     *
     * @return
     * @throws IOException
     */
    private static TrackerServer getTrackerServer() throws IOException {
        TrackerClient trackerClient = new TrackerClient();
        TrackerServer trackerServer = trackerClient.getConnection();
        return trackerServer;
    }

    /**
     * 获取文件路径
     *
     * @return
     */
    public static String getTrackerUrl() {
        TrackerClient trackerClient = new TrackerClient();
        TrackerServer stareServer = null;
        StorageServer storeStorage = null;
        try {
            stareServer = trackerClient.getConnection();
            storeStorage = trackerClient.getStoreStorage(stareServer);
        } catch (Exception e) {
            logger.error("文件路径获取失败", e.getMessage());
        }
        // ToDo 此处可能有问题 注意端口问题
        return "http://dfs.leyun68.com/";
    }
}
